CN104377729B - It is applicable in the reverse-power protection method for grid-connect mode photovoltaic power station of generating power for their own use - Google Patents
It is applicable in the reverse-power protection method for grid-connect mode photovoltaic power station of generating power for their own use Download PDFInfo
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- CN104377729B CN104377729B CN201410667182.8A CN201410667182A CN104377729B CN 104377729 B CN104377729 B CN 104377729B CN 201410667182 A CN201410667182 A CN 201410667182A CN 104377729 B CN104377729 B CN 104377729B
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- 230000004224 protection Effects 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000010248 power generation Methods 0.000 claims abstract description 12
- 238000012806 monitoring device Methods 0.000 claims description 13
- 230000004308 accommodation Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 abstract description 11
- 238000009826 distribution Methods 0.000 abstract description 9
- 238000011160 research Methods 0.000 abstract description 2
- 241000196324 Embryophyta Species 0.000 description 22
- 230000005611 electricity Effects 0.000 description 5
- 238000005457 optimization Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 238000012544 monitoring process Methods 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
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- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
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Classifications
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- H02J3/383—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/003—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to reversal of power transmission direction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The present invention relates to the reverse-power protection method for being applicable in grid-connect mode photovoltaic power station of generating power for their own use, step is as follows：Value and the direction of the realtime power of grid-connected points of common connection are monitored, the realtime power value measured is compared with photovoltaic plant rated power, if reverse power is more than the setting value of photovoltaic plant rated output power, lowers inverter output power and timing step by step；If the time is more than time limit value, each grid-connected breaker of sub- photo-voltaic power generation station is cut off step by step.The present invention reduces the impacts to power distribution network, the usage time of photovoltaic generation is increased simultaneously, reduce user power utilization cost, power regulating system is scientific and reasonable, can meet the scientific research for grid-connect mode distributed photovoltaic power generation related field of generating power for their own use and the demand of engineer application.
Description
Technical field
The invention belongs to photovoltaic generation control fields, are related to a kind of applicable grid-connect mode photovoltaic power station of generating power for their own use
Reverse-power protection method.
Background technology
According to country to the development plan of distributed generation resource, the distributed generation resource installed capacity in coming years China can be presented
It is large-scale to increase.A kind of grid-connect mode generated power for their own use as photovoltaic power station is generally used for user side electricity consumption and bears
Lotus is larger and power load continues, in 1 year few halt productions or half stop production in the case of, this kind of system, if user power utilization
It can not dissolve, upper level power grid can be sent to by the way that transformer is counter, and distribution transformer design is not to be allowed for anti-power transmission can
(can fall power transmission in short-term, such as when debugging, and not allow for a long time), initial direction of tide design is fixed, so needs
Counterflow-preventing safeguard measure is taken the counter of electric power to be avoided to send.
At present, there is an urgent need to propose that one kind can be according to feeding distribution for grid-connect mode photovoltaic power station of generating power for their own use
The reverse-power protection optimization system of net watt level and precise downregulation photovoltaic plant output power, so as to ensure that power grid security can
Realize that the grid-connect mode photovoltaic power station owner that generates power for their own use is benefited maximization under the premise of by property.
Invention content
The object of the present invention is to provide a kind of inverse probability guarantors suitable for grid-connect mode photovoltaic power station of generating power for their own use
Maintaining method impacts caused by power grid to solve to reduce the grid-connected breaker of the frequent division of inverse probability monitoring device, improves power supply
System security reliability reduces user power utilization cost.
To achieve the above object, the solution of the present invention includes：
The reverse-power protection method for grid-connect mode photovoltaic power station of generating power for their own use is applicable in, step is as follows：
1) value and the direction of the realtime power of grid-connected points of common connection, the realtime power value and photovoltaic plant that will be measured are monitored
Rated power is compared,
2) if reverse power is more than the setting value of photovoltaic plant rated output power, inverter output power is lowered step by step
And timing；
3) if the time is more than time limit value, each grid-connected breaker of sub- photo-voltaic power generation station is cut off step by step.
After each sub- photo-voltaic power generation station is cut off step by step, by certain time, compare the realtime power of points of common connection again
It is step by step that each sub- photo-voltaic power generation station is grid-connected when within the setting value with photovoltaic plant rated power.
The setting value is 5%.
The time limit value is 2s.
The present invention is under the premise of power supply quality and reliability is ensured, by increasing work(to traditional inverse probability monitoring device
Rate regulating system avoids the Frequent trip and reclosing of the grid-connected breaker of grid-connect mode photovoltaic power station of generating power for their own use,
Reduce the impact to power distribution network, while increase the usage time of photovoltaic generation, reduce user power utilization cost, power regulation
Systematic science is reasonable, and the scientific research and engineering that can meet grid-connect mode distributed photovoltaic power generation related field of generating power for their own use should
Demand.
Description of the drawings
Fig. 1 is a kind of photovoltaic parallel in system；
Fig. 2 is a kind of flow chart of embodiment of guard method of the present invention；
Fig. 3 is excision photovoltaic plant control logic；
Fig. 4 is to restore photovoltaic generating system cutting-in control logic.
Specific embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
The present invention will be further described in detail below in conjunction with the accompanying drawings.
It is a kind of inverse probability guarantor suitable for grid-connect mode photovoltaic power station of generating power for their own use of the present invention as shown in Figure 1
Optimization system is protected, is made of inverse probability monitoring device and power regulating system, energy when emergent power adverse current is sent into public electric wire net
It is enough to lower photovoltaic generating system inverter output power first with power regulating system, if it is inverse to meet grid-connected requirement recycling
Power monitor device cut-out photovoltaic generating system generates electricity by way of merging two or more grid systems, and after inverse probability phenomenon disappears, is realized using inverse probability monitoring device
Photovoltaic generating system generates electricity by way of merging two or more grid systems, adjust automatically photovoltaic system electricity generation power, reaches balance with load consuming power, controls photovoltaic
Electricity generation system output power meets grid-connected requirement.
It is a kind of inverse probability guarantor suitable for grid-connect mode photovoltaic power station of generating power for their own use of the present invention as shown in Figure 2
Optimization system flow chart is protected, downward photovoltaic plant output power when being mainly used for realizing the power of input power distribution network more than 5%
Restore two kinds of purposes of photovoltaic electric station grid connection when meeting grid-connected require with the power of input distribution.
Inverse probability monitoring device：For monitoring the realtime power of the points of common connection (measurement point) of garden and common line,
And it is uploaded to power regulation system by the realtime power value P measured and to the divide-shut brake instruction that photovoltaic electric station grid connection breaker is sent out
System.The power direction that public electric wire net is flowed to garden is set as positive direction, when measurement point garden occurs to public electric wire net output side
5% and the power regulating system for the value of power (i.e. inverse probability) and inverse probability being more than photovoltaic plant rated power can not be in 2s
When inverse probability value is lowered to the 5% of photovoltaic plant rated power, sends out and jump the instruction of photovoltaic electric station grid connection breaker, step by step tripping
Until inverse probability value meets grid-connected requirement, (i.e. inverse probability value is less than the specified work(of photovoltaic plant to the grid-connected breaker of each sub-light overhead utility
The 5% of rate)；After photovoltaic plant off-network 600s, inverse probability monitoring device continues to measure measurement point realtime power, if meeting grid-connected
It is required that closing each sub- photovoltaic electric station grid connection breaker step by step, photovoltaic electric station grid connection is realized.
Power regulating system：Refer to for inverse probability monitoring device to be avoided frequently to send out jump conjunction photovoltaic electric station grid connection breaker
It enables, reduces photovoltaic plant and impacted caused by frequent reclosing is power distribution network.When measurement point inverse probability value is more than photovoltaic plant volume
When determining the 5% of power, power regulating system starts rapidly, lowers the output power of each inverter of photovoltaic plant step by step, adjusts width
Spend Δ P=| | P |-| 0.04Pe| |, photovoltaic plant is made to be run with the output power of P- Δs P；When photovoltaic plant is restored simultaneously by off-network
After net, power regulating system starts rapidly, raises the output power of each inverter of photovoltaic plant, promotes photovoltaic power generation quantity as early as possible.
(1) photovoltaic plant output power is lowered
Using the closed loop control mode of hardware controls after first software adjustment, i.e., when the reverse power of injection power distribution network is more than light
Overhead utility rated output power Pe5% when, first with photovoltaic generation power regulating system lower photovoltaic DC-to-AC converter output work
Rate, if the reverse power that power grid is injected in 2s is less than photovoltaic plant rated output power Pe5%, then do not need to inverse probability
Monitoring device performs operation；Otherwise according to Fig. 3 reverse-power protections optimization system excision photovoltaic plant control logic, inverse probability monitoring
The grid-connected breaker of device to each sub-light overhead utility issues trip command, cuts off each sub-light overhead utility step by step, until meeting grid-connected
It is required that.
(2) restore photovoltaic electric station grid connection
Inverse probability monitoring device starts timing while cutting off each sub-light overhead utility, according to Fig. 4 reverse-power protections optimization system
System restores photovoltaic generating system cutting-in control logic, and inverse probability monitoring device continues to measure the real-time work(of points of common connection after 600s
Rate, when the reverse power of injection power distribution network is less than the 5% of photovoltaic plant rated power, inverse probability monitoring device is lied prostrate to each sub-light and is sent out
Electric station grid connection breaker sends out reclosing command, step by step that each sub- photo-voltaic power generation station is grid-connected, power regulating system up-regulation inverter
Generated output completes a reverse-power protection, and after photovoltaic plant restores grid-connected by off-network, power regulating system starts rapidly,
The output power of each inverter of photovoltaic plant is raised, promotes photovoltaic power generation quantity as early as possible.
(3) cycle performs above-mentioned flow.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.The base of the present invention
This thinking is above-mentioned basic scheme, and for those of ordinary skill in the art, various changes are designed in introduction according to the present invention
The model of shape, formula, parameter do not need to spend creative work.It is right without departing from the principles and spirit of the present invention
The change, modification, replacement and modification that embodiment carries out are still fallen in protection scope of the present invention.
Claims (3)
1. it is applicable in the reverse-power protection method for grid-connect mode photovoltaic power station of generating power for their own use, which is characterized in that step is as follows：
1) value and the direction of the realtime power of grid-connected points of common connection are monitored, the realtime power value and the photovoltaic plant that measure is specified
Power is compared,
If 2) reverse power is more than the setting value of photovoltaic plant rated output power, inverter output power is lowered step by step and is counted
When, amplitude of accommodation Δ P=| | P |-| 0.04Pe| |, photovoltaic plant is made to be run with the output power of P- Δs P, P is photovoltaic plant tune
Power before section, PeFor photovoltaic plant rated output power；
3) if the time is more than time limit value, each grid-connected breaker of sub- photo-voltaic power generation station is cut off step by step；
Inverse probability monitoring device cuts off each sub- photo-voltaic power generation station step by step, starts timing while each sub-light overhead utility is cut off, warp
Inverse probability monitoring device after 600s is crossed to continue to measure the realtime power of points of common connection, compare the realtime power of points of common connection with
Photovoltaic plant rated power, it is step by step that each sub- photo-voltaic power generation station is grid-connected when within the setting value.
2. a kind of reverse-power protection side for being applicable in grid-connect mode photovoltaic power station of generating power for their own use according to claim 1
Method, which is characterized in that the setting value is 5%.
3. a kind of reverse-power protection side for being applicable in grid-connect mode photovoltaic power station of generating power for their own use according to claim 1
Method, which is characterized in that the time limit value is 2s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410667182.8A CN104377729B (en) | 2014-11-20 | 2014-11-20 | It is applicable in the reverse-power protection method for grid-connect mode photovoltaic power station of generating power for their own use |
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| CN201410667182.8A CN104377729B (en) | 2014-11-20 | 2014-11-20 | It is applicable in the reverse-power protection method for grid-connect mode photovoltaic power station of generating power for their own use |
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| CN104377729A CN104377729A (en) | 2015-02-25 |
| CN104377729B true CN104377729B (en) | 2018-06-26 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099858B (en) * | 2016-05-23 | 2018-06-29 | 国电南瑞科技股份有限公司 | A kind of method for improving reverse-power in the generator protection precision |
| CN108919106A (en) * | 2018-05-30 | 2018-11-30 | 厦门科华恒盛股份有限公司 | A kind of fault detection means and method of the static switch for UPS |
| CN109339941A (en) * | 2018-10-19 | 2019-02-15 | 国网上海市电力公司 | A kind of distributing-supplying-energy system of energy-saving and emission-reduction |
| CN109861299A (en) * | 2019-04-22 | 2019-06-07 | 协鑫能源工程有限公司 | Anti- inverse probability autocontrol method, device and grid-connected power generation system |
| CN113241789A (en) * | 2021-04-16 | 2021-08-10 | 江苏固德威电源科技股份有限公司 | High-voltage grid-connected anti-reflux method and system for photovoltaic power station |
| CN113300406A (en) * | 2021-06-28 | 2021-08-24 | 上海电机学院 | Unidirectional distributed grid-connected photovoltaic power generation system and control method thereof |
Citations (1)
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| CN103368203A (en) * | 2013-06-26 | 2013-10-23 | 国家电网公司 | Photovoltaic reverse-power closed loop control system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368203A (en) * | 2013-06-26 | 2013-10-23 | 国家电网公司 | Photovoltaic reverse-power closed loop control system and method |
Non-Patent Citations (2)
| Title |
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| 光伏电站中的逆功率保护功能;黄海;《机械制造与自动化》;20101031;第39卷(第5期) * |
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